populations
how does a population grow
by reproducing
the distribution of ages in a specific population at a given time
what is an example of a habitat
forests, desserts, grasslands, and oceans
what is human population
what was the population in 1000
310 million
all the members of a species living in the same place at the same time
what is migration
the movement of individuals between areas
what is a niche
a species physical home
what is exponential growth
growth rate goes up every decade
what was the population is 1800
1 billion
what is a populations density
number of the same kind
what is life expectancy
the average number of years a person is likely to live
what is competition in a habitat
what causes human population to decrease
diseases and child mortality
what was the population in 1927
2 billion
what normally causes a population to die off
disease
what is Urbanization
when more people live in cities than rural areas
what is a adaptation to competition in a habitat
when two species with similar niches are placed together in the same ecosystem
what was the human population in 0 A.D
300 million
what was the population in 1960
3 billion
what can cause a population to change
migration
what is Infrastructure
the basic facilities and services that support a community
what would happen if two niches got put together
there would be to man organisms in one place and they could fight over the niche
people would be able to reproduce if men and women were split up
false
what was the population in 1974
4 billion